Abstract
A scanning Hall microprobe technique has been developed to measure the magnetic field around superconductors, and to make precision measurements of the]] critical state" profiles in single crystals of YBa2Cu 3O7-y. The field around a superconducting crystal has been calculated for the Meissner state and for the remanent state. This enables a quantitative analysis of the critical state profiles, and a novel method to determine JC. The invasion of magnetic flux above HC1 was examined and this provides direct evidence for the existence of a surface barrier to the entry of magnetic flux lines. The temperature dependence of JC was also measured and compared with that of the low TC material Nb0.5Ti0.5.
Original language | English (US) |
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Pages (from-to) | 3890-3902 |
Number of pages | 13 |
Journal | Journal of Applied Physics |
Volume | 73 |
Issue number | 8 |
DOIs | |
State | Published - 1993 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy